The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.Referenceshttps://www.openssh.com/txt/release-7.6http://www.securityfocus.com/bid/101552https://github.com/openbsd/src/commit/a6981567e8e215acc1ef690c8dbb30f2d9b00a19https://security.gentoo.org/glsa/201801-05https://security.netapp.com/advisory/ntap-20180423-0004/https://access.redhat.com/errata/RHSA-2018:0980https://lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlhttps://www.oracle.com/security-alerts/cpujan2020.htmlhttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
